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Top of the Hill

Pro Problems > Physics > Energy and Work > Work
 

Top of the Hill

Bobby (who weighs 85 pounds) takes his sled (which weighs 5 pounds) to the top of a snowy hill which is 30 feet tall. He starts out at a full stop and accelerates down the hill without propeling himself by hand. When he reaches the bottom, he is traveling at 40
ft
s
. Assuming no wind resistance, calculate how much work was done by friction.

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Problem by Mr. H

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